wetmore



March 15, 1927. 1,621,227

C. P. WETMOR E REAMER Filed June 2 1921 2 Sheets-Shanta ATTORNEYS.

Ill)

Patented Mar. 15, 1927.

UNITED STATES PATENT OFFICE.

CHARLES P. WETMORE, OF MILWAUKEE, VIISCONSIN, ASSIGNOR TO WETMORE REAMER COMFANY, OF MILWAUKEE, VISCONSIN, A CORPORATION OF WISCONSIN.

REAMER.

Application filed June 21,

This invention relates more particularly to expansible reamers having adjustable and renewable blades.

The main objects of the invention are to provide for free lateral adjustment of the head relative to the arbor and thus compensate for eccentricity of the work to the spindle of the machine in which the reamer is used; to locate the floating connection between the head and arbor within the head close to the blades, thereby avoiding any tendency to cramp or bind; to effectively protect the floating connection against dust, chips and grit; and generally to simplify and improve the construction and operation of rearners of this class.

The invention consists in tl e construction, arrangement and combination of parts as hereinafter particularly described and point ed out in the claims.

In the accompanying drawing like characters designate the same parts in the several figures.

Figure 1 is a longitudinal section on the line 1-1, Figs. 3 and 5, of an expansible floating reamer embodying the invention; Fig. 2 is a similar section of the reamer on the line 22, Fi s 3 and 5; Fig. 3 is a cross section of the reamcr on the line 3-3, Fig. 1; F 4; is a side elevation of the reainer; Fig. 5 is a front elevation of the adjustable nut for securing the reamer head or body to the arbor; and Fig. 6 is an enlarged cross section of a blade and portion of the .rcamer head showing one of the screws for securing the blades in the head.

The expansible floating reamer as shown by the drawing, comprises a head or body 1, and a separate arbor 2, with which the head or body has a floating connection so as to permit a free but limited lateral movement of the head with its blades transversely to its axis, and thus compensate for slight eccentricity or inaccuracy in the setting of the wor; relative to the driving spindle with which the reainer is connected and cause the reamer head to maintain axial alignment with the bore or hole to be reamed.

The head 1, which may be made of cylindrical or polygonal shape, is provided at its back end with an externally screwthreacled neck 3, which may be conveniently made separate therefrom and attached thereto by a screwthread, with the front end abutting against a shoulder formed on the head. The

1921. Serial No. 479,356.

neck, which is of hollow cylindrical shape, forms a cylindrical recess or cavity in the rear end of the head, which communicates through an axial bore in the head with a cylindrical recess formed in its front end.

The head or body 1 is formed with radial longitudinal blade grooves 5, having bottoms inclined outwardly from its axis towards the front end of the reamer, as shown in Figs. 1 and 2. Blades 6, removably and loosely fitted in the grooves 5, are formed in their back faces adjacent their inner edges, with longitudinal V-shaped grooves 7, as shown in Fig. 6, and are rigidly secured in place in the head by screws 8, threaded in holes formed in the head obliquely to and intersecting the back walls of the grooves 5. The grooves 7 in the backs of the blades are made to register with the screw holes in the head, so that the inner ends of the locking screws 8 will engage the inwardly and rearwardly sloping sides of the grooves, as shown in Fig. 6, and thus tend to tip the outer cutting edges of the blades backward and hold their backs firmly against the outer edges of the back walls of the grooves 5, and their inner front corners or edges against the bottoms and front walls of the grooves, which are of slightly greater width than the thickness of the blades, the bottoms of the grooves or the inner edges of the blades being slightly inclined trans- .rsely thereto, so that the inner rear corners of the blades clear the bottoms of the grooves. This method of fastening the blade." in the reamer head effects their rigid support at the backs adjacent their outer edges, and at their inner front edges. thereby counteracting the tendency of the cutting strains to which the blades are sub jected to tip the blades backward! and cause chattering or imperfect work, and insuring even, true and smooth cutting, the construction and arrangement described above where by this action is possible being claimed in divisional application Serial No. 723,695, filed July 2, 1924.

For floating or finishing reamers of this kind, the blades are preferably set at a left hand angle, as shown in Fig. 4, and hence be grooves 5 of the head in which they are held, are inclined backwardly toward the front. end of the reamer. The inner edges of the blades 6 are inclined to correspond with the inclination of the bottoms of the grooves 5,

while their outer cutting edges are parallel with the axis of the reamer.

An adj Listing nut 10. threaded on the neck 3, is beveled on its front side to engage with and overhang the back ends of the blades, which are correspondingly beveled. By the adjustment of this nut, which may be graduated, as shown in Fig. 1, for this purpose, the blades are adjusted to compensate for grinding or sharpening and for accurately reaming bores or holes, to exact predetermined size. The nut 10 is rigidly secured in adjusted position by a locknut 1l tl ided on the neck 3. The arbor 2 is loosely titted so as to be capable of a limited lateral movement in the recess formed by the neck 3' at the back end of the reamer head, and is formed with a central stem 13, passing loosely through the axial bore in the head into the recess in its front end. A collar 1% is fitted on the stem 13, and a nut 15 is threaded on the stem next to the cellar witl in the recess in the front end of the head or body 1, for holding the parts of the ream-er together. The nut 15, shown in Figs. 1, 2 and 5, is formed in opposite sides with transverse clefts, and is provided with hear-- ing screws 17 and locking screws 18.

As shown in Fig. 2, the bearing screws 17 pass through and are threaded in both leaves of the nut on opposite sides thereof, and engage at their inner or rear ends with the collar 14.

As shown in Fig. 1, the locking screws 18 are threaded in the front or outer leaves and engage at their inner ends the rear or inner leaves of the nut. The screws 17 are adjusted to take up wear or play between the assembled parts of the reainer. and at the same time to permit the head 1 to freely shift transversely tothe arbor and the s-rews 18 are then turned inwardly against the inner leaves of the nut 15, thereby spreading the inner and outer-leaves and ansin screwthreads therein to bind on and lO'L'n' the screws 17. The nut is provided, shown in Fig. with holes 19, for a spanner wrench.

A flat floating and driving ring or disk 2i, is looselv fitted in the neck 3, or the recess in the back end of the head and around the stem 13 between the head and arbor.v It is formed with-two pairs of diametrically op posite circular openings 23. A pair of pins 2st fixed in the arbor 2, project therefrom parallel with its axis into one pair of openings 23. as shown in Figs. 1 and 3', and a pair of like or similar pins 25. fixed in the head 1, projecttherefrom in the opposite direction, parallel. with its axis, into the other pair of openings 23 in the ring 21,.as shown in Figs. 2 l 9 anu a. Each of the several pins which are of smaller diameter than the openings 2", is formed in one side with a concave longitudinal groove, and between the grooved side of each pin and the opposing side of the circular opening 23 into which it projects, a cylindrical roller 27, of shorter radius than the radius of the groove in the pin, is inserted.

The screws 17 being adjusted to produce an even free working fit between the collar 14 and the inner end of the front recess in the head 1 and between the. opposing faces of the ring 21 and of the head and arbor, and the power required to turn the head in reaming being transmitted from the arbor through the rollers 2'7, very little resistance is opposed to the transverse shifting n'iov-einent of the head.

The floating and driving connections between the arbor and head are protected against dust, rit and chips, by a removable clap 29, threaded in and closing the opening into the front recess in the head, and by a washer 30, of felt or other suitable material,

held in contact with the back end of tie neck 3 by a groove in the front face of a flange or shoulder 31 formed on the arbor 2, thereby closing the opening into the recess in the back end of the head.

The floating and driving connections may be further protected as shown in Fig. 1 by guards 32 of felt, metal or other suitable material, inserted in the back ends of the blade grooves 5 next to the floating ring and closing the openings therefrom into the recess in the back end of. the head.

Various modifications in the details of construction and arrangement of parts of the reamer may be made without departure from the principle and scope of the invention as defined in the following claims. For example, certain features of the device, such as the means shown and described for adjusting and fastening the blades in the head. may be employed to advantage in roughing and semi-finishing reamers which do not have a floating connection between the head and arbor, and in other similar tools, such as milling tools.

I claim:

1. In a reamer, in combination, a head provided with recesses at the ends thereof and an axial bore connecting said recesses, an arbor loosely fitted into one of said recesses for lateral movement with respect to said head, said arbor being provided with a stem extending through said bore into the other of said recesses, said stem having a loose fit in said bore, a driving connection arranged between said head and said arbor to permit lateral movement between said parts, and means applied to the end of said stem to hold said head and arbor in assembled relation.

2. In a reamer, in combination, a head provided with recesses at the ends thereof and an axial bore connecting said recesses, an arbor loosely fitted into one of said recesses for lateral movement with respect to llO said head, said arbor being provided with a stem extending through said bore into the other of said recesses, said stem having a loose fit in said bore, a ring arranged upon said stem between said head and said arbor, said ring being provided with a plurality of openings, means arranged within each of said openings to permit lateral movement between said head and said arbor, said means connecting said head and arbor for rotation together, and means applied to the end of said stem to hold said head and arbor in assembled relation.

In a reamer the combination of a head provided with recesses in the ends connected by a central longitudinal bore, an arbor loosely fitting in the back recess of the head and having a reduced stem loosely fitting in said bore, a nut threaded on the stem within the front recess for holding the head and arbor together, a floating ring loosely fitting within the back recess of the head and around the arbor stem between the arbor and head and formed with two pairs of diametrically opposite openings, longitudinally grooved pins fixed in the arbor and projecting therefrom into one pair of openings in the ring, similar pins fixed in the head and projecting therefrom into the other pair of openings in the ring, and rollers loosely fitted in the grooves of the pins and projecting therefrom towards the opposing sides of the openings in the ring.

4. In a reamer the combination of a head provided with blades and formed with end recesses connected by an axial bore, an arbor loosely fitted in the back recess of the head and provided with an axial stem loosely fitting said bore, a floating ring loosely fitting within the back recess of the head and around the arbor stem between the head and arbor and formed with two pairs of diametrically opposite openings, grooved pins fixed in the arbor and projecting longitudinally therefrom into one pair of openings in the ring, similar pins fixed in the head and projecting therefrom into the other pair of openings in the ring, rollers loosely fitted in the grooves in the pins and projecting therefrom into engagement with the opposite sides of the openings in the ring, a collarfitted on the arbor stem within the front recess of the head, a nut threaded on the stem next to the collar and transversely cleft on opposite sides, adjustable bearing screws threaded in and passing through the cleft sides of the nut into engagement with the collar, and locking screws threaded in the outer leaves and engaging the inner leaves of the nut.

5. In a reamer the combination of a head provided with recesses in the ends connected by an axial bore, an arbor loosely fitted in the back recess and having a central stem passing loosely through said bore, a floating ring loosely fitting Within the back recess of the head, and around the stem of the arbor and formed with two pairs of diametrically opposite circular openings, pins fixed in the arbor and projecting therefrom into one pair of openings in the ring, similar pins fixed in the head and projecting therefrom into the other pair of openings in the ring, the several pins being of smaller diameter than the openings in the ring and formed with concave longitudinal grooves, rollers of shorter radius than the radius of the grooves in the pins interposed between the grooved sides of the pins and the opposing sides of the openings in the ring, and a nut threaded on the arbor stem within the front recess of the head, for holding the head and arbor with the interposed floating ring, together.

6. In a reamer the combination of a head provided with recesses in the ends connected bya reduced axial bore, an arbor loosely fitted in the back recess of the head and formed with a stem loosely fitted in the reduced bore of the head and with alaterally grooved flange next to the inner end of the head, a floating ring loosely fitted within the back recess of the head and around the stem of the arbor and formed with two pairs of diametrically opposite openings, concave-grooved pins fixed in the arbor and projecting therefrom loosely into a. pair of openings in the ring, similar pins fixed in the head and projecting therefrom loosely into the other pair of openings in the ring, rollers loosely fitted in the grooves of the pins and projecting therefrom into engagement with the opposing sides of the openings in the ring, a nut threaded on the arbor stem within the front recess in the head and adj ustably holding the arbor and head with the interposed ring together, a removable dust cap for closing the opening into the front recess of the head, and a dust washer held in the grooved flange on {he arbor in contact with the adjacent end of the head.

7. In a reamer the combination of a head formed with an axial bore, an arbor having at its front end a reduced axial stem passing through and having lateral play in said bore, a flat floating and driving ring loosely encircling the stem between the head and arbor and formed with two pairs of diametrically opposite openings, pins projecting longitudinally from the arbor loosely into one pair of openings, pins projecting in the opposite direction loosely into the other pair of openings in the ring, and a member adjustably mounted on the stem for holding the head and arbor together and taking up play between the opposing faces of the floating ring, and of the arbor and head. 7

8. In a reamer, a hollow head provided with a partition intermediate the ends thereof to form recesses on either side of said partition, said partition being provided with a central opening connecting said recesses, an arhorhaving one end thereof fitted into one of said recesses and provided with a stem extending through said opening into the other of said recesses, and means applied to the end of said stem for holding said heat and arbor in assembled relation. I

S). In a reamer, a head provided with an axial opening, an arbor having one enc' thereof reduced to form a stem, said stein extending loosely through said opening, means applied to the end of said stem for holding said head and arbor against axial movement with respect to each other but permitting relative transverse movement of the same, a ring loosely mounted on said stem between said head and said arbor, and means associated with said ring and coacting with said head and arbor whereby the latter are connected for rotation together and for transverse moven'ient with respect to each other.

10. In a reamer, a hollow head provided with a partition intermediate the ends thereof to form recesses on either side of said partition, said partition being provided with a central opening connecting said recesses, an arbor having one end thereof loosely fitted into one of said recesses and reduced to provide a stem extending loosely through said opening into the other of said recesses whereby said head is permitted to move transversely with respect to said ar bor, means applied to the end of said stem and arranged in said last-mentioned recess and engaging said partition whereby said head is held againstaxial movement with respect to said arbor but permitted to move transversely with respect. to the latter, a ring loosely mounted on said stem and arranged between said head and said arbor, and means associated with said ring and co acti with said head and arbor whereby the latter are connected for rotation together and for transverse movement with respect to each other.

In a reamer, a head provided with a recess in one end thereof, an arbor provided with a flange and aportion extending beyond the latter and fitting loosely in said recess, means arranged in said recess and c with said head and arbor for connecting the latter for rotation together while permitting relative lateral play of the same with respect to each other, packing material arranged between and held in poion by said flange and the adjacent end of said head for preventing the entrance of foreign limiter between the same into said recess, and means for holding said head and arbor in assembled relation.

12. In a reamer, a head. an arbor having a portion thereof extending through said head, a nut screwed upon the end of said portion and provided with a transverse cleft fi'irming leaves, a screw passing through said leaves and arranged to hold said head and arbor against relative axial movement and to take up play between the latter, and a e'cond screw passing through one of said es and engaging the other of said leaves whereby the latter are spread apart and said screws and said nut locked in adjusted position.

13. In a reamer, a head provided with an axial opening, an arbor provided with a grooved flange and a stem extending beyond the latter, said stem extending through said opening, packing material arranged in the groove of said flange between the latter and the adjacent end of said head, and means applied to the end of said stem for holding said head and arbor in assembled relation with said end of said head in sealing engagement with said packing material.

In witness whereof I hereto attiX my signature.

i L "Le CHARLES P. VETMORE. 

